WO1994021929A1 - Optimized elastic belleville fastener useful in eyeglass frames - Google Patents
Optimized elastic belleville fastener useful in eyeglass frames Download PDFInfo
- Publication number
- WO1994021929A1 WO1994021929A1 PCT/US1994/002225 US9402225W WO9421929A1 WO 1994021929 A1 WO1994021929 A1 WO 1994021929A1 US 9402225 W US9402225 W US 9402225W WO 9421929 A1 WO9421929 A1 WO 9421929A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washer
- shank
- pin
- fastener
- hole
- Prior art date
Links
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 13
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 17
- 230000001788 irregular Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 238000007373 indentation Methods 0.000 claims description 6
- 229910001000 nickel titanium Inorganic materials 0.000 abstract description 7
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005482 strain hardening Methods 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 description 13
- 239000000956 alloy Substances 0.000 description 13
- 230000006399 behavior Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000010956 nickel silver Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C5/00—Constructions of non-optical parts
- G02C5/22—Hinges
- G02C5/2281—Special hinge screws
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
- F16B39/26—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object with spring washers fastened to the nut or bolt-head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/284—Locking by means of elastic deformation
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C1/00—Assemblies of lenses with bridges or browbars
- G02C1/06—Bridge or browbar secured to or integral with closed rigid rims for the lenses
- G02C1/08—Bridge or browbar secured to or integral with closed rigid rims for the lenses the rims being tranversely split and provided with securing means
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C5/00—Constructions of non-optical parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
- F16B21/10—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts
- F16B21/16—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings by separate parts with grooves or notches in the pin or shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/77—Use of a shape-memory material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/909—Fastener or fastener element composed of thermo-responsive memory material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/31—Spectacle-frame making
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49947—Assembling or joining by applying separate fastener
- Y10T29/49948—Multipart cooperating fastener [e.g., bolt and nut]
Definitions
- the present invention relates to fasteners used in eyeglass frames for holding lenses into lens frames and temple pieces to the lens frames and hinges.
- Screws specifically are used to attach temple pieces at the hinge to lens frames. They are also used to tension and anchor or lock lenses into lens frames allowing assembly and disassembly for replacement of lens or damaged components or initial shipping of frames with demonstration lenses in place.
- eyeglass frames In normal use eyeglass frames are subjected to stresses and strains in a cyclical manner that tend to loosen screws and wear the threads with which the screws are mated resulting in temple pieces becoming loose or detached and lenses falling out of their frames.
- U.S. Patent No. 4,896,955 (“the '955 patent”), the subject matter of which is hereby incorporated by reference, discloses an eyeglass frame, of which components are formed from nickel-titanium based shape memory alloys. Components of the frame can be formed from such alloys treated in a variety of ways, to confer desired properties on the component. For example, fastening elements used in the frame can exhibit conventional shaped memory properties of the alloy. Other components of the frame can exhibit the enhanced elastic properties exhibited by shape memory alloys.
- a shape memory alloy can exhibit "super elastic" behavior at a temperature below the M s of the alloy as a result of a significant degree of work-hardening, for example to about 30% or more plastic deformation.
- a temperature range of -20 °C to 40 °C By selection of an alloy with an appropriate M s temperature, with appropriate work-hardening, such behavior can be obtained in a temperature range of -20 °C to 40 °C.
- a shape memory alloy can exhibit "pseudo-elastic" properties. Such properties are exhibited in a narrow temperature range, between the M s and M d temperatures of the alloy. They involve transformation of an alloy in its austenite phase to its martensite phase by the application of stress. Application of stress in these conditions can give rise to high strain values. Provided that the temperature is between the M s and the M d temperatures of the alloy, virtually all of the strain is recovered. The deformation and recovery are marked by significant deviations from linear elastic behavior.
- a shape memory alloy which has been work-hardened, perhaps to 30% or more plastic deformation, and at a temperature between its M s and M d temperature, exhibits a combination of superelastic and pseudoelastic behavior known as "optimized elastic” behavior.
- the optimized elastic behavior is referred to in the '955 patent as "work- hardened pseudoelastic" behavior.
- shape memory alloys which exhibit enhanced elastic behavior in the manufacture of eyeglass frames, for their kink resistance.
- Pseudoelastic properties are particularly preferred, because of the large amount of strain which can be recovered.
- a disadvantage of relying on pseudoelastic properties is that they are available only over a narrow temperature range. This problem was addressed in the '955 patent by subjecting shape memory alloy eyeglass frame components to work-hardening. In this way, the advantages of superelastic behavior, and some of the advantages of pseudoelastic behavior can be obtained from temperatures below the M s temperature up to the M d temperature of the selected alloy.
- the invention provides a fastener comprising a pin and a belleville washer.
- the pin includes a shank and the washer includes a hole therethrough extending between opposite sides of the washer, the hole being sized to provide an interference fit with the shank.
- the washer is of a titanium-nickel shape memory alloy in an optimized elastic condition. The optimized elastic behavior provides a degree of tightening heretofore unavailable while minimizing the need for tight tolerances and while compensating for wear of components held together by the fastener.
- the pin can include a flange extending radially outwardly from one end of the shank and the other end of the shank can be tapered to facilitate entry in. the hole of the washer.
- the washer can be conical in shape such that the entire conical surface extending between the hole and an outer periphery of the washer is inclined with respect to a normal to a central axis passing through the hole. For instance, the conical surface can be inclined at an angle of at least 10° with respect to the normal to the central axis.
- the shank can be provided with a smooth or irregular outer surface.
- the irregular surface can comprise a plurality of axially spaced-apart indentations extending circumferentially around the shank and the indentations can be concave in axial cross section.
- the hole is preferably circular and the shank is preferably cylindrical, the hole being sized to have a diameter smaller than a maximum outer diameter of the shank.
- the fastener can be used to hold together components of an eyeglass frame.
- the shank of the pin can extend through axially aligned bores in two discrete components of an eyeglass frame such that the washer is press fitted on the shank and prevents the two components of the eyeglass frame from being removed from the pin.
- the shank of the pin can extend through a bore in another component of the eyeglass frame and the washer can be press fitted on the shank to prevent the component from being removed from the pin.
- the optimized elastic behavior of the washer can be utilized over a temperature range of -20 °C to 4-40° C, the range of temperatures most eyeglass frames are subjected to when in use.
- a tool for assembling the fastener.
- the tool can include a washer supporting surface and a displaceable centering pin which is movable in an axial direction and sized to pass through the hole in the washer.
- the washer supporting surface surrounds the centering pin and is sized to surround the shank of the pin when the washer is press fitted onto the shank of the pin.
- the centering pin can be spring mounted in a socket in the tool.
- the washer support surface can be annular in shape and perpendicular or inclined with respect to the axial direction.
- the washer support surface can be used to deform the conical washer into a flattened shape with the edge of the washer defining the hole pressing tightly against the shank of the pin.
- the washer support surface is inclined (e.g., the washer supporting surface and the washer can both be conical in shape)
- a different insertion tool having a flat (non-inclined) washer support surface can be used to flatten the washer against a component from which the shank of the pin extends.
- the invention also provides a method of attaching the fastener described above.
- the method includes inserting the shank of the pin through a bore in a component and pressing the washer onto a free end of the shank such that the washer holds the shank of the pin in the bore of the component.
- the washer has a conical surface extending between the hole and the outer periphery of the washer, the washer can be deformed during the pressing step such that the conical surface is substantially flattened and the flattened surface presses against the component.
- the component can form part of an eyeglass frame and the pin can include a radially outwardly extending flange.
- the shank can be passed through a bore of a second component of the eyeglass frame during the inserting step and the washer can be pressed onto the shank until the flange presses against the second component during the pressing step.
- FIG. 1 is a cross-sectional view of a fastener in accordance with the invention
- FIG. 2 is a perspective view of a pin which can be used as part of the fastener in accordance with the invention
- FIG. 3 is a detail drawing showing a fluted surface on the pin shown in FIG. 2;
- FIG. 4 is a perspective view of another pin which can be used in accordance with the invention.
- FIG. 5 shows a top view of a belleville washer in its as manufactured condition which can be used as part of the fastener in accordance with the invention
- FIG. 6 shows a side view of the washer shown in FIG. 5;
- FIG. 7 shows a side view of the washer shown in FIG. 6 subsequent to a shaping step wherein the washer is given a conical shape
- FIG. 8 is a schematic drawing of an installation tool for assembly of fastener of the invention.
- the invention provides a fastener which can be used to replace threaded screws for eyeglass components with the advantage of eliminating the loosening and wear typical of screws.
- the fastener according to the invention allows positioning, tensioning and locking with the added advantage of being capable of being disassembled and reassembled at will.
- the fastener includes a flanged pin and mating "optimized elastic" Ni-Ti based alloy belleville washer.
- the mating diameters of the pin and hole in the washer are preferably sized to provide an interference fit with the leading end of the pin preferably being tapered to allow alignment and initial entry into the washer.
- the pin can include flutes along the length thereof. However, adequate gripping between the pin and washer can be obtained when the pin is smooth along the length thereof.
- the pin and washer can be adjusted relative to each other to provide a desired tension and/or position. The tool advances the pin into the washer and spring loads the "optimized elastic" Ni-Ti based alloy belleville washer against a part such as a lens frame or hinge component of an eyeglass frame.
- the extraordinary elasticity of the optimized elastic Ni-Ti alloy belleville washer will maintain a fairly uniform spring loading on the joined components even as wear occurs in the sliding surfaces of the components.
- the disassembly tool should be capable of pressing the pin out of the washer. For example, by removing the pin, the eyeglass frame components can be separated from each other. Subsequently assembly can be accomplished using the same components or a new pin and washer set by the method noted above.
- the invention provides a fastener 1 including a pin 2 and washer 3, as shown in the assembled condition in FIG. 1.
- the pin 2 and washer 3 can be used to hold a first component 4 and a second component 5 of an eyeglass frame together.
- the washer 3 preferably has the conical shape shown in FIG. 1 and the washer 3 can be pressed against the component 5 such that the washer 3 either maintains the conical shape or is flattened completely against the component 5.
- the pin 2 includes a shank 6 and the pin 2 can include a tapered end 8 and a radially outwardly extending flange 7.
- the outer surface of the shank 6 can have an irregular surface 9.
- FIG. 3 is a detail of the irregular surface shown in FIG. 2.
- the irregular surface 9 can comprise a plurality of axially spaced-apart indentations 10 extending circumferentially around the shank. As shown in FIG. 3, the indentations can be convex in axial cross-section.
- the shank 6 can have a smooth surface 11 , as shown in FIG. 4.
- the flange 7 can optionally include a slot or socket 12 to facilitate mounting of the pin 2 on a tool used for inserting the pin 2 in a bore through a component.
- the washer 3 includes a hole 13 having a diameter smaller than an outer diameter of the shank 6.
- the washer is made from a titanium- nickel based shape memory alloy in an optimized elastic condition.
- the optimized elastic condition can be provided by work hardening a sheet of Ni-Ti at temperatures between the M s and M d of the alloy. Subsequently, the washer 3 can be stamped or cut out of the sheet, the hole 13 can be stamped in the washer 3 and the washer 3 can be deformed from the flattened condition shown in FIG. 6 to the conical shape shown in FIG. 7. As shown in FIG.
- the washer 3 includes a conical surface extending between the hole 13 and the outer periphery of the washer 3.
- the conical surface 14 forms an angle with a normal to a central axis of the hole 13.
- the angle is preferably greater than 10° and more preferably ranges from 15 to 30°.
- FIG. 8 shows an insertion tool 15 for press fitting the washer
- the tool 15 includes a displaceable centering pin 17 movable in an axial direction and sized to pass through the hole 13 in the washer 3.
- the centering pin 17 can be mounted on a spring 18 and the spring 18 and centering pin 17 can be located in a socket 16 of the tool 15.
- the tool also includes a washer supporting surface 19 which surrounds the centering pin 17 and is sized to surround the shank 6 of the pin 2 when the washer 3 is press fitted onto the shank 6 of the pin 2.
- the washer support surface 19 can be annular in shape and perpendicular or inclined to the axial direction.
- the edge of the washer 3 defining the hole 13 is expanded over the outer surface of the shank 6 until the washer 3 contacts the component 5.
- the washer supporting surface 19 or a separate tool can be used to deform the conically shaped washer 3 such that it is flattened against the component 5.
- the Ni-Ti material of the washer 3 may or may not include one or more alloying elements.
- the material of the washer 3 can optionally be subjected to heat treatment provided the material of the washer 3 retains some work hardening.
- a flat washer 3 as shown in FIG. 6 can be placed in a die having a conical shape. Due to springback, the conical shape of the die should be more tapered than the desired conical shape of the washer 3. For instance, in order to obtain a taper of 15 to 20° in the final conical shape of the washer 3, the die can be provided with a taper of over 30° such as about 45°.
- the pin 2 can be of any suitable material which provides an interference fit with the washer 3.
- the pin 2 can be of copper or a copper base alloy, steel such as stainless steel, German silver or other metal, ceramic or plastic material.
- the pin 2 and washer 3 can have various dimensions and shapes provided they can be assembled together to provide an interference fit.
- the pin 2 can include a shank 6 having an outer diameter of 0.053" and a radially outwardly extending flange 7 having an outer diameter of 0.073".
- the washer 3 can be conical in shape such that surfaces 14 of the washer 3 form an angle with a normal to the central axis of the hole 13 in the washer 3.
- the hole 13 in the washer 3 should be smaller than the outer diameter of the shank 6 of the pin 2. For example, if the shank 6 has an outer diameter of 0.053" the hole 13 can have a diameter of 0.049".
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Eyeglasses (AREA)
Abstract
A fastener (1) useful for attaching components of an eyeglass frame together. The fastener includes a pin (2) having a smooth or fluted shank and a belleville washer (3) having a hole for receiving the shank, the hole being sized to provide an interference fit with the washer. The washer (3) is made from a titanium nickel shape memory alloy in an optimized elastic condition. The optimized elastic condition is provided by work hardening a sheet of Ni-Ti and cutting or stamping the washer out of the sheet. The washer is also plastically deformed into a conical shape.
Description
OPTIMIZED ELASTIC BELLEVILLE FASTENER USEFUL IN EYEGLASS FRAMES
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to fasteners used in eyeglass frames for holding lenses into lens frames and temple pieces to the lens frames and hinges.
2. Description of Related Art
Historically small screws have been used to attach various eyeglass frame components together to form a completed frame. Screws specifically are used to attach temple pieces at the hinge to lens frames. They are also used to tension and anchor or lock lenses into lens frames allowing assembly and disassembly for replacement of lens or damaged components or initial shipping of frames with demonstration lenses in place.
In normal use eyeglass frames are subjected to stresses and strains in a cyclical manner that tend to loosen screws and wear the threads with which the screws are mated resulting in temple pieces becoming loose or detached and lenses falling out of their frames.
Various methods to minimize this problem have been tried with limited success. Examples are polymeric compounds often referred to as "locktite" intended to at least slow down the loosening process.
This method requires individual coating of the screws which is expensive and provides only limited improvement over uncoated screws eventually succumbing to the same process of loosening. Another example of a method intended to "lock" the screws in place is the use of distorted threads on the screw to create a mechanical jamming action with the mating threads. This method offers only limited improvement again eventually succumbing to the loosening process as well. Both methods make any replacement or disassembly and reassembly process difficult or impossible and do not accommodate wear of the mated components even if no loosening or backing out of the screws occurs.
U.S. Patent No. 4,896,955 ("the '955 patent"), the subject matter of which is hereby incorporated by reference, discloses an eyeglass frame, of which components are formed from nickel-titanium based shape memory alloys. Components of the frame can be formed from such alloys treated in a variety of ways, to confer desired properties on the component. For example, fastening elements used in the frame can exhibit conventional shaped memory properties of the alloy. Other components of the frame can exhibit the enhanced elastic properties exhibited by shape memory alloys.
A shape memory alloy can exhibit "super elastic" behavior at a temperature below the Ms of the alloy as a result of a significant degree of work-hardening, for example to about 30% or more plastic deformation. By selection of an alloy with an appropriate Ms temperature, with appropriate work-hardening, such behavior can be
obtained in a temperature range of -20 °C to 40 °C.
A shape memory alloy can exhibit "pseudo-elastic" properties. Such properties are exhibited in a narrow temperature range, between the Ms and Md temperatures of the alloy. They involve transformation of an alloy in its austenite phase to its martensite phase by the application of stress. Application of stress in these conditions can give rise to high strain values. Provided that the temperature is between the Ms and the Md temperatures of the alloy, virtually all of the strain is recovered. The deformation and recovery are marked by significant deviations from linear elastic behavior.
A shape memory alloy which has been work-hardened, perhaps to 30% or more plastic deformation, and at a temperature between its Ms and Md temperature, exhibits a combination of superelastic and pseudoelastic behavior known as "optimized elastic" behavior. The optimized elastic behavior is referred to in the '955 patent as "work- hardened pseudoelastic" behavior.
It is advantageous to use shape memory alloys which exhibit enhanced elastic behavior in the manufacture of eyeglass frames, for their kink resistance. . Pseudoelastic properties are particularly preferred, because of the large amount of strain which can be recovered. However, a disadvantage of relying on pseudoelastic properties is that they are available only over a narrow temperature range.
This problem was addressed in the '955 patent by subjecting shape memory alloy eyeglass frame components to work-hardening. In this way, the advantages of superelastic behavior, and some of the advantages of pseudoelastic behavior can be obtained from temperatures below the Ms temperature up to the Md temperature of the selected alloy.
SUMMARY OF THE INVENTION
The invention provides a fastener comprising a pin and a belleville washer. The pin includes a shank and the washer includes a hole therethrough extending between opposite sides of the washer, the hole being sized to provide an interference fit with the shank. In addition, the washer is of a titanium-nickel shape memory alloy in an optimized elastic condition. The optimized elastic behavior provides a degree of tightening heretofore unavailable while minimizing the need for tight tolerances and while compensating for wear of components held together by the fastener.
The pin can include a flange extending radially outwardly from one end of the shank and the other end of the shank can be tapered to facilitate entry in. the hole of the washer. The washer can be conical in shape such that the entire conical surface extending between the hole and an outer periphery of the washer is inclined with respect to a normal to a central axis passing through the hole. For instance, the conical surface can be inclined at an angle of at least 10° with respect to the normal to the central axis. The shank can be provided with a smooth or irregular outer surface. For instance, the irregular surface
can comprise a plurality of axially spaced-apart indentations extending circumferentially around the shank and the indentations can be concave in axial cross section. The hole is preferably circular and the shank is preferably cylindrical, the hole being sized to have a diameter smaller than a maximum outer diameter of the shank.
According to one feature of the invention, the fastener can be used to hold together components of an eyeglass frame. For instance, the shank of the pin can extend through axially aligned bores in two discrete components of an eyeglass frame such that the washer is press fitted on the shank and prevents the two components of the eyeglass frame from being removed from the pin. Alternatively, in the case where the pin forms part of a component of an eyeglass frame, the shank of the pin can extend through a bore in another component of the eyeglass frame and the washer can be press fitted on the shank to prevent the component from being removed from the pin. The optimized elastic behavior of the washer can be utilized over a temperature range of -20 °C to 4-40° C, the range of temperatures most eyeglass frames are subjected to when in use.
According to another aspect of the invention, a tool is provided for assembling the fastener. The tool can include a washer supporting surface and a displaceable centering pin which is movable in an axial direction and sized to pass through the hole in the washer. The washer supporting surface surrounds the centering pin and is sized to surround the shank of the pin when the washer is press fitted onto the shank of the pin. The centering pin can be spring mounted in a
socket in the tool. The washer support surface can be annular in shape and perpendicular or inclined with respect to the axial direction. Thus, when the tool is used to press fit the washer onto the shank of the pin, the washer support surface can be used to deform the conical washer into a flattened shape with the edge of the washer defining the hole pressing tightly against the shank of the pin. In cases where the washer support surface is inclined (e.g., the washer supporting surface and the washer can both be conical in shape), a different insertion tool having a flat (non-inclined) washer support surface can be used to flatten the washer against a component from which the shank of the pin extends.
The invention also provides a method of attaching the fastener described above. In particular, the method includes inserting the shank of the pin through a bore in a component and pressing the washer onto a free end of the shank such that the washer holds the shank of the pin in the bore of the component. In the case where the washer has a conical surface extending between the hole and the outer periphery of the washer, the washer can be deformed during the pressing step such that the conical surface is substantially flattened and the flattened surface presses against the component. The component can form part of an eyeglass frame and the pin can include a radially outwardly extending flange. The shank can be passed through a bore of a second component of the eyeglass frame during the inserting step and the washer can be pressed onto the shank until the flange presses against the second component during the pressing step.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a fastener in accordance with the invention;
FIG. 2 is a perspective view of a pin which can be used as part of the fastener in accordance with the invention;
FIG. 3 is a detail drawing showing a fluted surface on the pin shown in FIG. 2;
FIG. 4 is a perspective view of another pin which can be used in accordance with the invention;
FIG. 5 shows a top view of a belleville washer in its as manufactured condition which can be used as part of the fastener in accordance with the invention;
FIG. 6 shows a side view of the washer shown in FIG. 5;
FIG. 7 shows a side view of the washer shown in FIG. 6 subsequent to a shaping step wherein the washer is given a conical shape; and
FIG. 8 is a schematic drawing of an installation tool for assembly of fastener of the invention.
DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENTS
The invention provides a fastener which can be used to replace threaded screws for eyeglass components with the advantage of eliminating the loosening and wear typical of screws. The fastener according to the invention allows positioning, tensioning and locking with the added advantage of being capable of being disassembled and reassembled at will.
According to one aspect of the invention, the fastener includes a flanged pin and mating "optimized elastic" Ni-Ti based alloy belleville washer. The mating diameters of the pin and hole in the washer are preferably sized to provide an interference fit with the leading end of the pin preferably being tapered to allow alignment and initial entry into the washer. To provide enhanced gripping, the pin can include flutes along the length thereof. However, adequate gripping between the pin and washer can be obtained when the pin is smooth along the length thereof. Through the use of a simple tool, the pin and washer can be adjusted relative to each other to provide a desired tension and/or position. The tool advances the pin into the washer and spring loads the "optimized elastic" Ni-Ti based alloy belleville washer against a part such as a lens frame or hinge component of an eyeglass frame.
As the eyeglass frames are subjected to the usual cyclical stresses and strains in normal use, the extraordinary elasticity of the optimized elastic Ni-Ti alloy belleville washer will maintain a fairly uniform spring loading on the joined components even as wear occurs
in the sliding surfaces of the components.
Another simple tool can be used to disassemble the pin/washer combination. The disassembly tool should be capable of pressing the pin out of the washer. For example, by removing the pin, the eyeglass frame components can be separated from each other. Subsequently assembly can be accomplished using the same components or a new pin and washer set by the method noted above.
The fastener according to the invention will now be described with reference to FIGS. 1-8. In particular, the invention provides a fastener 1 including a pin 2 and washer 3, as shown in the assembled condition in FIG. 1. According to a preferred embodiment of the invention, the pin 2 and washer 3 can be used to hold a first component 4 and a second component 5 of an eyeglass frame together. Further, the washer 3 preferably has the conical shape shown in FIG. 1 and the washer 3 can be pressed against the component 5 such that the washer 3 either maintains the conical shape or is flattened completely against the component 5.
As shown in FIG. 2, the pin 2 includes a shank 6 and the pin 2 can include a tapered end 8 and a radially outwardly extending flange 7. If desired, the outer surface of the shank 6 can have an irregular surface 9. FIG. 3 is a detail of the irregular surface shown in FIG. 2. As shown in FIG. 2, the irregular surface 9 can comprise a plurality of axially spaced-apart indentations 10 extending
circumferentially around the shank. As shown in FIG. 3, the indentations can be convex in axial cross-section. Alternatively, the shank 6 can have a smooth surface 11 , as shown in FIG. 4. In addition, the flange 7 can optionally include a slot or socket 12 to facilitate mounting of the pin 2 on a tool used for inserting the pin 2 in a bore through a component.
The washer 3 includes a hole 13 having a diameter smaller than an outer diameter of the shank 6. When the washer 3 is press fitted onto the shank 6, the edge of the washer 3 defining the hole 13 is elastically deformed such that it is expanded and tightly grips the outer surface of the shank 6. The washer is made from a titanium- nickel based shape memory alloy in an optimized elastic condition. The optimized elastic condition can be provided by work hardening a sheet of Ni-Ti at temperatures between the Ms and Md of the alloy. Subsequently, the washer 3 can be stamped or cut out of the sheet, the hole 13 can be stamped in the washer 3 and the washer 3 can be deformed from the flattened condition shown in FIG. 6 to the conical shape shown in FIG. 7. As shown in FIG. 7, the washer 3 includes a conical surface extending between the hole 13 and the outer periphery of the washer 3. The conical surface 14 forms an angle with a normal to a central axis of the hole 13. The angle is preferably greater than 10° and more preferably ranges from 15 to 30°.
FIG. 8 shows an insertion tool 15 for press fitting the washer
3 onto the shank 6 of the pin 2. The tool 15 includes a displaceable centering pin 17 movable in an axial direction and sized to pass
through the hole 13 in the washer 3. The centering pin 17 can be mounted on a spring 18 and the spring 18 and centering pin 17 can be located in a socket 16 of the tool 15. The tool also includes a washer supporting surface 19 which surrounds the centering pin 17 and is sized to surround the shank 6 of the pin 2 when the washer 3 is press fitted onto the shank 6 of the pin 2. The washer support surface 19 can be annular in shape and perpendicular or inclined to the axial direction. Thus, when the washer 3 is press fitted onto the shank 6 of the pin 2, the edge of the washer 3 defining the hole 13 is expanded over the outer surface of the shank 6 until the washer 3 contacts the component 5. The washer supporting surface 19 or a separate tool can be used to deform the conically shaped washer 3 such that it is flattened against the component 5.
The Ni-Ti material of the washer 3 may or may not include one or more alloying elements. In addition, the material of the washer 3 can optionally be subjected to heat treatment provided the material of the washer 3 retains some work hardening. In forming the conical shape of the washer 3, a flat washer 3, as shown in FIG. 6, can be placed in a die having a conical shape. Due to springback, the conical shape of the die should be more tapered than the desired conical shape of the washer 3. For instance, in order to obtain a taper of 15 to 20° in the final conical shape of the washer 3, the die can be provided with a taper of over 30° such as about 45°. Thus, when the washer 3 is pressed into the die, to form the conical shape upon release of the deforming force the washer 3 will spring back to a conical shape having the desired angle.
The pin 2 can be of any suitable material which provides an interference fit with the washer 3. For instance, the pin 2 can be of copper or a copper base alloy, steel such as stainless steel, German silver or other metal, ceramic or plastic material. The pin 2 and washer 3 can have various dimensions and shapes provided they can be assembled together to provide an interference fit. For example, the pin 2 can include a shank 6 having an outer diameter of 0.053" and a radially outwardly extending flange 7 having an outer diameter of 0.073". The washer 3 can be conical in shape such that surfaces 14 of the washer 3 form an angle with a normal to the central axis of the hole 13 in the washer 3. In a flattened condition, the hole 13 in the washer 3 should be smaller than the outer diameter of the shank 6 of the pin 2. For example, if the shank 6 has an outer diameter of 0.053" the hole 13 can have a diameter of 0.049".
The foregoing has described the principles, preferred embodiments and modes of operation of the present invention. However, the invention should not be construed as being limited to the particular embodiments discussed. Thus, the above-described embodiments should be regarded as illustrative rather than restrictive, and it should be appreciated that variations may be made in those embodiments by workers skilled in the art without departing from the scope of the present invention as defined by the following claims.
Claims
1. A fastener comprising a pin and a belleville washer, the pin including a shank and the washer including a hole extending between opposite sides of the washer, the hole being sized to provide an interference fit with the shank and the washer being of a titanium- nickel shape memory alloy in an optimized elastic condition.
2. The fastener of Claim 1, wherein the pin includes a flange extending radially outwardly from one end of the shank.
3. The fastener of Claim 1, wherein the washer includes a conical surface extending between the hole and an outer periphery of the washer is inclined with respect to a central axis passing through the hole.
4. The fastener of Claim 1 , wherein the surface is inclined at an angle of at least 10° with respect to a normal to the central axis.
5. The fastener of Claim 1, wherein the shank has a smooth outer surface.
6. The fastener of Claim 1, wherein the shank has an irregular outer surface.
7. The fastener of Claim 6, the irregular surface comprises a plurality of axially spaced-apart indentations extending circumferentially around the shank.
8. The fastener of Claim 7, wherein the indentations are convex in axial cross section.
9. The fastener of Claim 1 , wherein the hole is circular and the shank is cylindrical, the hole having a diameter smaller than a maximum outer diameter of the shank.
10. The fastener of Claim 1, wherein the shank of the pin extends through axially aligned bores in two discrete components of an eyeglass frame, the washer being press fitted on the shank and preventing the two components of the eyeglass frame from being removed from the pin.
11. The fastener of Claim 1 , wherein the shank of the pin extends through a bore in a component of an eyeglass frame, the washer being press fitted on the shank and preventing the component of the eyeglass frame from being removed from the pin.
12. The fastener of Claim 1 , wherein the shank has a free end which is tapered such that the shank becomes smaller in diameter in a direction towards the free end of the shank.
13. A tool for assembling a fastener comprising a pin and a belleville washer, the pin including a shank and the washer including a hole extending between opposite sides of the washer, the hole being sized to provide an interference fit with the shank and the washer being of a titanium-nickel shape memory alloy in an optimized elastic condition, the tool including a displaceable centering pin movable in an axial direction and sized to pass through the hole in the washer and a washer supporting surface, the washer supporting surface surrounding the centering pin and being sized to surround the shank of the pin when the washer is press fitted onto the shank of the pin.
14. The tool of Claim 13, wherein the centering pin is spring mounted in a socket in the tool.
15. The tool of Claim 13, wherein the washer support surface is annular in shape and lies in a plane which is perpendicular to the axial direction.
16. A method of attaching a fastener comprising a pin and a belleville washer, the pin including a shank and the washer including a hole extending between opposite sides of the washer, the hole being sized to provide an interference fit with the shank and the washer being of a titanium-nickel shape memory alloy in an optimized elastic condition, comprising steps of inserting the shank of the pin through a bore in a component and pressing the washer onto a free end of the shank such that the washer holds the shank of the pin in the bore of the component.
17. The method of Claim 16, wherein the washer has a conical surface extending between the hole and an outer periphery of the washer, the washer being deformed during the pressing step such that the conical surface is substantially flattened and the flattened surface presses against the component.
18. The method of Claim 16, wherein the component forms part of an eyeglass frame and the pin includes a radially outwardly extending flange, the method further including passing the shank through a bore of a second component of the eyeglass frame during the inserting step.
19. The method of Claim 18, wherein the washer is pressed onto the shank until the flange presses against the second component.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/035,627 US5395193A (en) | 1993-03-23 | 1993-03-23 | Optimized elastic belleville fastener useful in eyeglass frames |
US08/035,627 | 1993-03-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994021929A1 true WO1994021929A1 (en) | 1994-09-29 |
Family
ID=21883840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/002225 WO1994021929A1 (en) | 1993-03-23 | 1994-03-01 | Optimized elastic belleville fastener useful in eyeglass frames |
Country Status (2)
Country | Link |
---|---|
US (1) | US5395193A (en) |
WO (1) | WO1994021929A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2734874A1 (en) * | 1995-05-31 | 1996-12-06 | Snecma | Attachment of bearing on shaft |
FR2934335A1 (en) * | 2008-07-22 | 2010-01-29 | Peugeot Citroen Automobiles Sa | Element i.e. roof bar, anchoring fixation device for roof panel of motor vehicle, has clamping element pressed against walls of foot in clamping position, where element exerts frictional forces on walls for holding roof bar to be fixed |
WO2020143276A1 (en) * | 2019-01-11 | 2020-07-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Loose-proof screw assembly and fastened structure comprising the same |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5578034A (en) * | 1995-06-07 | 1996-11-26 | Danek Medical, Inc. | Apparatus for preventing screw backout in a bone plate fixation system |
US5674027A (en) * | 1995-11-20 | 1997-10-07 | Applied Research Associates, Inc. | Exaggerated actuation and bearing-free rotational mobility in smart hinges |
US7620527B1 (en) | 1999-05-10 | 2009-11-17 | Johan Leo Alfons Gielis | Method and apparatus for synthesizing and analyzing patterns utilizing novel “super-formula” operator |
AU5135100A (en) * | 1999-05-14 | 2000-12-05 | Patrick White | Stress-induced seal |
US6435519B1 (en) | 1999-05-14 | 2002-08-20 | Patrick Michel White | Stress-induced gasket |
US7150680B2 (en) | 1999-05-14 | 2006-12-19 | Precimed S.A. | Drive shaft coupling |
US6257593B1 (en) | 1999-05-14 | 2001-07-10 | Patrick Michel White | Stress induced interposed connector |
US6637995B1 (en) | 2000-02-09 | 2003-10-28 | Patrick Michel White | Super-elastic rivet assembly |
GB2393927A (en) * | 2002-10-09 | 2004-04-14 | Bae Systems Plc | A method of assembling components |
TWM243584U (en) * | 2003-09-05 | 2004-09-11 | Hon Hai Prec Ind Co Ltd | Captive screw |
JP3916085B2 (en) * | 2004-06-28 | 2007-05-16 | シャープ株式会社 | Fastening parts and equipment having a fastening structure |
CN102435771B (en) * | 2011-09-01 | 2013-06-12 | 中国航空工业第六一八研究所 | Locking device for improving stability of accelerometer |
EP2860592B1 (en) * | 2013-10-09 | 2023-07-05 | Nivarox-FAR S.A. | Assembly system using a planar resilient locking member |
CN105889277A (en) * | 2014-12-05 | 2016-08-24 | 安顺市晶英科技研发有限责任公司 | Novel automatic disengagement-preventing bolt |
US10487589B2 (en) | 2016-01-20 | 2019-11-26 | Baker Hughes, A Ge Company, Llc | Earth-boring tools, depth-of-cut limiters, and methods of forming or servicing a wellbore |
US10508323B2 (en) * | 2016-01-20 | 2019-12-17 | Baker Hughes, A Ge Company, Llc | Method and apparatus for securing bodies using shape memory materials |
US10280479B2 (en) | 2016-01-20 | 2019-05-07 | Baker Hughes, A Ge Company, Llc | Earth-boring tools and methods for forming earth-boring tools using shape memory materials |
US10569370B2 (en) * | 2016-09-12 | 2020-02-25 | Baker Hughes, A Ge Company, Llc | Mechanical locking mechanism using shape memory materials |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3203302A (en) * | 1963-09-12 | 1965-08-31 | Frederick Henry | Self-locking sheet metal nut |
US3619478A (en) * | 1969-03-27 | 1971-11-09 | Int Standard Electric Corp | Electrical connecting element |
US4624092A (en) * | 1984-10-22 | 1986-11-25 | Illinois Tool Works Inc. | Roofing membrane fastener |
US5224248A (en) * | 1992-02-07 | 1993-07-06 | Brilliant Jo A | Attaching a temple to an eyewire of an eyeglass frame |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2230916A (en) * | 1939-01-07 | 1941-02-04 | Tinnerman Products Inc | Sheet metal nut |
US3367228A (en) * | 1966-01-12 | 1968-02-06 | John O. King Jr. | Fastener with improved locking means |
JPS588817A (en) * | 1981-07-03 | 1983-01-19 | 株式会社山科精工所 | Elastic washer |
US4880343A (en) * | 1987-09-30 | 1989-11-14 | Matsumoto Kokan Co., Ltd. | Lock nut having lock member of shape memory recovery alloy |
JPH0425607A (en) * | 1990-05-15 | 1992-01-29 | Nitto Seiko Co Ltd | Manufacture of screw incorporating washer |
-
1993
- 1993-03-23 US US08/035,627 patent/US5395193A/en not_active Expired - Lifetime
-
1994
- 1994-03-01 WO PCT/US1994/002225 patent/WO1994021929A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3203302A (en) * | 1963-09-12 | 1965-08-31 | Frederick Henry | Self-locking sheet metal nut |
US3619478A (en) * | 1969-03-27 | 1971-11-09 | Int Standard Electric Corp | Electrical connecting element |
US4624092A (en) * | 1984-10-22 | 1986-11-25 | Illinois Tool Works Inc. | Roofing membrane fastener |
US5224248A (en) * | 1992-02-07 | 1993-07-06 | Brilliant Jo A | Attaching a temple to an eyewire of an eyeglass frame |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2734874A1 (en) * | 1995-05-31 | 1996-12-06 | Snecma | Attachment of bearing on shaft |
FR2934335A1 (en) * | 2008-07-22 | 2010-01-29 | Peugeot Citroen Automobiles Sa | Element i.e. roof bar, anchoring fixation device for roof panel of motor vehicle, has clamping element pressed against walls of foot in clamping position, where element exerts frictional forces on walls for holding roof bar to be fixed |
WO2020143276A1 (en) * | 2019-01-11 | 2020-07-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Loose-proof screw assembly and fastened structure comprising the same |
Also Published As
Publication number | Publication date |
---|---|
US5395193A (en) | 1995-03-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5395193A (en) | Optimized elastic belleville fastener useful in eyeglass frames | |
US4186787A (en) | Floating anchor nut assembly and basket member component | |
US5584631A (en) | Optimized elastic fastener useful in eyeglass frames | |
US5544992A (en) | Panel fastener having composite turning knob | |
US6257593B1 (en) | Stress induced interposed connector | |
EP0702161B1 (en) | Ball joint and a manufacturing method therefor | |
US6637995B1 (en) | Super-elastic rivet assembly | |
EP1262670B1 (en) | Fastener and washer assembly | |
US4770584A (en) | Demountable pin, particularly suitable for the lever mechanisms of textile machines | |
JPH01120412A (en) | Structure of lock nut | |
WO1998055895A1 (en) | Hinge connection for eyeglass frame | |
JPH11148509A (en) | Lock nut | |
WO2005074823A1 (en) | Bone fixation apparatus | |
AU2002350958A1 (en) | Method of fastening | |
US5871402A (en) | Composite internally threaded fastener and method of making the same | |
US5499893A (en) | Flexible lock nut and method of manufacturing | |
US20210231160A1 (en) | Composite Fastener with Locking Cap Feature | |
CA2254634C (en) | Metallic fastening member and fabrication method thereof | |
WO1999020914A1 (en) | Structural interlock for inhibiting relative rotation between mating elements | |
CA2327039A1 (en) | Reliable bolt and clip restrainer assembly | |
WO1985002688A1 (en) | Eyeglass frame including shape memory elements | |
CA2647960A1 (en) | Method for inserting connecting elements in metal sheets and connection between a metal sheet and a connecting element | |
EP1055075B1 (en) | Blind rivet connector | |
CN115041549A (en) | Thermal check clamp for elastic check ring for hole and machining method | |
JP3272265B2 (en) | Lock nut |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA JP |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: CA |